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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0b2b49e5755349b4a690413b54e8a531c3ac7c9f62e251f75dedef0f7dcd94ea' 
  AND token = 'nonGmCoEqjcWt7NeaZsiLPrA0B8JzDrR7cLimHIrZkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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