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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c748c2d8d40af1f22b2b6d02991ad3cc83dddb3cee313555b22097448ce4cac6' 
  AND token = 'Sfo7p0pRb7BMeGSYlmeFy6IU/5IloCmRtmn+Ucw5hYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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