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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eca0d2db38f76737159450a5756d829d711e98eec3dceaf653027eb1821a2bdd' 
  AND token = 'aqtKcdykKHn1UW//5x2gXDMHAnDeATj8eMvDDtxfGGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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