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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c98f329c0ed7729144232ce22dcd3d8999d5fc9015e0be78785f1ecc74ae717c' 
  AND token = 'sWsJOHe0HvCfoV+Qf9YcoHuQR2k1nvMDIipZnSlTnf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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