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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '708ab2da927e0a0cc70d07d23fd1851457e8ec38dc199c49e1b18809b1c2ede1' 
  AND token = '1agknUn4+SfcvBBaoE8m/t5VicvWZVPxdlzheK1MjUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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