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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2ec9f07c25ab1a572a9cddd4361fba529d7cb89f636b9cc03d7138b26a0e099' 
  AND token = 'mJrsLLuJLDi5tHkzEZ1GM0Gh0LOjKIydhHufxtlM64M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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