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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56321a010ce2e4c83d1eaacd2d495230f79e37b44340df0bb233cda6f5da42d6' 
  AND token = '27B2BB5QC0+TKKlJvV74TN5XPTb0cfyoPOH8b/X97LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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