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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9aa5dba4323d218d289b6632a0aa65fbb7fc1498716cebc4fea62d9c93b7f15e' 
  AND token = '7Tr8QrzeqdepYJQsNI+D/L44H9EtyQyBuxBO6Z+0T2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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