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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '394e012ccd3c7a5b696093766a4064656174006ad33349353ec2aa044c5b4e0c' 
  AND token = 'iv3CpToTKKB5ETSg5j9br3CsYOUvfGN9YpRPFuGwIgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}