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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e2e95f8b7c4fae093a57438c74f799c1f11bb5215bd19cfff6c1c87bc939752' 
  AND token = 'y7JxNTUUsS8fNVUNS87OXUxenCnEe4eS61GSWCt060Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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