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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9357152f0c3674db7ebf1c7c075443e9dac6e0d8ed93e84150331e854bb7f11e' 
  AND token = 'gqpoix2qt9yPCsWLxqaeHYt1RkLFi6dyKcpfS5Dsowo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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