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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4f3c2f0b13ef721dd922f4b338d927a491e01aa6caa345528d0e033c8ae5a3d' 
  AND token = 'EFM8JcbaaO8njrRzBWot2CDtlWs8oT9MLZVVwgc7HOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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