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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b98a8476d29a442bc076209b9ecb09d02ff89ccec562e0123a62d2e9c7834cc0' 
  AND token = 'r+SZManMOiC1Fe6hftLzTQVpNAwV/ValdkF2nLl3FPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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