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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '15d3f6ed7532478e0a0a4aebaac035677db5b5d6a5fdd590fb176efc24e908c3' 
  AND token = 'tx2zv5325bkGZ9H9fQ4B3y8fbT82IkQq06TBClo5mv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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