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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7e0dc3494be3572eb7b27357ddd092f7bc296d087344bb5820184a8c85b77a2' 
  AND token = 'E634c1nwyg/F+qNbguBtoyP/2re4LifsMmgNF9ZMGdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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