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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '75ac59f3fea6d9fd39b4bbfa33cd209a6e58ad92788541a405932033996ef0b0' 
  AND token = 'f9e4tJR8ln8xJOqqbAFEGSG3caBBNIbvNrNVk1qH7rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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