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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10ba8459ad5980b8cbeab9bac5b629dd3168a35e6847f69ec990bbc97cbb44b8' 
  AND token = 'hj1QUqlx7UFo6P1zcXYxGpNiVW5yydTJVTfVstBXpSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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