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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa07c1a0a4bbd7e05279f6d5b912403bec01910020afef0ef453a9af077cfb3c' 
  AND token = 'qlSbORXaRhNdQyxYUBY6xXFuxMdNCeRaQBDzmC90KF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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