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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6ba14e20065c401621df1b65906d5411c508b88d62f8a2e4bd16d99604ed9d81' 
  AND token = 'TEk5Ed6/anc99H6m0UcFvTh5AJhMOJNCmWkxo9/lhsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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