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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20ad585e8c1bc14eaf2b6b3887f89d01231a4a4d0922c076135a41428b0642c3' 
  AND token = 'kAWHOSoecHzo7VZTWzUDAClsAtqo1H1qqf1egaC2W/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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