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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b7e2d43c1345a7d7058d3790dca2c616fbe56f24e8f3bbef3156d2d0a274442' 
  AND token = '9kB7ILAPsWWAG93CLdYci5Qh53/4sDJxu9XJedhJOqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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