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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd1442a59c3585753515e5662918b8aac295e6377ac3df13f75af6414e38ecc02' 
  AND token = '/xgEmZupkst5z/T/CKCQdW5WU7DE+MFN8/dE8yRPuEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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