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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b82a12818809392c7fb0ec9fea0c95b123a98393309545dcf95ba547cf68abe7' 
  AND token = '7tijgx+nCbEkpn4bnyRh0akFiVzFyP6F0Rd0M69LhmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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