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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae8bd3aa596f6f214e26aa7a64953ded7718f574fc357cd019dc8a9114da7271' 
  AND token = 'h8JGEDOuIywpstbsFUM5preV7wb9WA/IcTvX0y3EqoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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