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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b27b07491527ac006f5a3f62a5c2dc8fa2893cd2029d6dd7bd700a6ba7f34323' 
  AND token = 'IzwiTf8qfdUJmp27Z1e5dlB2cmcsKbUQpn+JLyail8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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