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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f436a3f7b63f5a7176ead2e7770286a5e27f338205905aa2e6b7ac5f1ff3d9dd' 
  AND token = '2Q2flB5drury4YSWx++vdrtWlQ259OhYyWYS1oFJyIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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