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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '52a940aef46e655b38b369dc7427645a9acb0df58e703221a2d05e1dc4e8df5c' 
  AND token = 'DkTI4EBweHNMHIxIimZ3xYymF21JNq7Je1Q4UDuaESU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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