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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02b2e4b62669d063de82344f84a2ec1634cabf4bc12ef5dd735acd0963eb2828' 
  AND token = 'RCtiWeOSNJhnsR77wdfiiDkIYz3idfMhhWGcUsvJVjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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