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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '90a18015d03e515f8335fb8a34b05ca479bb574f409cc240e9a8ddfe6a5ade1b' 
  AND token = 'T2/Sec0saTR5k2826h+RYiScVJqnFBCTU3ouaA69DRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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