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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34c91e80b92be5143c4b0a2a5e1ba1c1fe254a3c03d209d7a410291b00467b9a' 
  AND token = 'qHEeLsUuqKOSlvy+2CxBKOSTGwUZsnKRdiXcvp4F4Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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