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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3cb4c1b5dbeb10ad1c621f141610895a34e2201c6a991acbb2c27fac0c26f80' 
  AND token = 'WHOUNxTZueWMW5LXF9/CLS+xphSSQG4qq1sIRcWKPEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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