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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b72ae9f3498c9ac7cacff73a14e11be8765551ab3d7efa26fb76a7cb5fb96f16' 
  AND token = 'CreERePCnIDAAN76MjfuGE/VyLraDgnHH5KeOdEyulM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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