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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8232a45f2c8c4f4c7ecb1f45af34ee410849a8ce4ef6ff99e8012579ba3cd233' 
  AND token = 'XhJtNLp8ntwcYmnZzIddS4zjdfoc+s2TFu8SGruWMfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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