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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7239ca807c9a75394b1ae832cc8bc55013303e455d1fb7146749c86cd00a16f5' 
  AND token = 'mm+0c149xDYOx00YupbzraB/VEeoe1OX+rcd+5tkBXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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