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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39b39abdc5b8df01587eb7549bccc39d50f1cb123c181ff2e5038059b40206cd' 
  AND token = 'pdfL67oG70yet9gUW3jA/hIqAvGMWmFkXfSleRvlSfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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