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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf97ef84de91964a3b401a5d4cdab90c2a2c063844d419d6b108d0c5547a45ef' 
  AND token = 'hEpN+IDApQXKe+I+Gjl5eEZlLCOnuoTrkV+3SFWucrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00208

JSON explain

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