SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b3b63e7f8384768c7dc007ad2de406093f3dcb9b990b45fef8b765810e95a8fb' 
  AND token = 'mLNF5pBBofui0Xq1FgJWboQTK2+gU8HL7jZyn1fjruA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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