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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca3200cbcc4a47a92e7b46559abb59917ebc80f985db953edcf18fd51844e701' 
  AND token = 'pbkbYW80mxbtQXz92SkWXzPGS4tuuCFKYaSbEz3rxWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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