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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '104529d6eb1c73ac37f1be4406e095ac245e92959959df24079c33431d09c1be' 
  AND token = 'G4EWPq4C3mij7ESeLkjw9C7tbX2fgi4kl8P36QkswTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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