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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a94b2e0e4debb039515890d11414a0aa72d48f11e59fa0c9f05e694c00cb0948' 
  AND token = 'mvnANp9mIuBxc7lzf7wTRVFolu52Us7z0RsZYHlemhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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