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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d8a74213d60ea0c6f8f2ea8874a50920e2f45f3dea572e8806a016035a79e5a' 
  AND token = 'bJvyR9bKD7Ny5xKwRF94S8XSFaqKf7qKIbrDdY8SfNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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