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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59386a24811eeb6ed7c8d1a34cdf47ae92cc3bc2ba3f90322fec2d5b69c61a83' 
  AND token = 'qdq2B6CPQ6hfALcZx14CWmHqUlu2dRR2BunxsfOYmFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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