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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '283307ef4d160b0f8220160d7f63843a3300c218ebe3fdede8c80ae0e2ad0c6a' 
  AND token = 'qWJkrAagdaC5cS1Olm3A3DleHB3jRr2gO/qZsVlBxVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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