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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58cb2c793f7f0d6c8cead6a075c25cdb9a85f17c37741b0467a326b6d710711e' 
  AND token = 'GWkjggK6Ix65bU9yktBDC/1o5cv12etX2jtewDBNYrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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