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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '690e3df7385b3571a79d68b7412604ba267c120c88726c222b6ea7fa3c38abc1' 
  AND token = 'U8wDOL0Ptufp9lSdknC6Oy/tChkFStAs2sUyWlBuuG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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