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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b39e8e54b068b98cb29c3d4cb62d8858a653638373b3cf492dbdbcb3a2b188c9' 
  AND token = 'LaCd2cv7WDZSqqbrPpigRdkCyXyTbuzb/vNxaP9V8w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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