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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '144306a785a767b283d0370bb9603abf66aa8ef99e393e4febfa20cbd162f484' 
  AND token = 'kdRz5qxCFlBLGabFKX1vuMipWlOi3m0q2WQiN/oMLzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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