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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bfcaea061388cf46c874e909883e5d153a707e017eaefca1da298fdb6eb3d609' 
  AND token = 'hQ0qMhN5xXG214u+p3OOpa5eHlVn4IX0RXnI99CE4Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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