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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9441dbad6eb278e1d38c04717c2413340b73fb5ccbb70529298b5000cc150b13' 
  AND token = 'dkD/7qTNsTusIuYqoGMcC+6+nO3d2SX9ePKmDn7oqJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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