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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae7283d12eaf45b267d260543945ec81024ce4ff48e1bf5ac493b89e30db167e' 
  AND token = 'lTaepTj6rNp3Pm3M7Ls5dqLCVOn63p/Ssm2/kbQ/2P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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