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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26a8c07181c79a9e048ef2c150b94f25eb90916dbc6ca0f10b9c027e36b541e6' 
  AND token = 'IZRagjebQUJEzntNuLjOi6LrRCIF8V6zGbc7fWAnpT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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