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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8936cd6c6d38f9c37f1bb2b6de437397df5becac75b6652ec1da748a47579ff1' 
  AND token = 'oTX/AihKuvGrZUn9OiWXmXDmO5CkoG0c3uQut8BvAtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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