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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bea34f4ecf40c122a5b5c447b1d1e1a1c8f7a90d0faf439cecefadf75ad6090' 
  AND token = '3oJsARPcfkBVTHqJ/CvQJVsrU09kbf+aUbisTkoUcig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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